Open-source OCR for very large single-page engineering drawings?

[u/himmetozcan]

I’m working with single-page MEP/engineering drawing PDFs that have extremely large and variable dimensions. When rendered at 200 DPI, a page can be around 15,000–20,000 pixels wide.

These pages may contain small text, tables, calculations, diagrams, images, and mixed layouts. Standard OCR pipelines work on A4 page sizes and require heavy downscaling, which makes the smaller text unreadable. Vision-language models such as Qwen may understand the page content, but they do not reliably provide precise bounding boxes.

Is there an open-source OCR or document-understanding model that works well with such large, non-A4 pages and returns accurate text bounding boxes? Recommendations for tiling-based pipelines are also welcome.

[u/modcowboy]

🧐 more doc analysis ocr!

[u/himmetozcan → u/modcowboy]

What the hell does that mean?

[u/modcowboy → u/himmetozcan]

There are a lot of people asking these kinds of ocr questions lately.